EGOCENTRIC LOCALIZATION AND SACCADIC PLASTICITY

意义 用手快速指向的实验显示视网膜外的眼睛 位置信号(ERS)比视觉内比较更准确 视觉稳定性的实验和研究一度似乎允许。凝视 有针对性的研究也得出了类似的结论，但这些实验 存在严重缺陷，早该复制了。马达系统 再培训计划的依赖性和详细的时间进程还没有被研究过 控制良好的以自我为中心的本地化范式。适应环境的变化 眼球跳动引发了这样一个问题：眼部位置是否可以 与再培训脱钩；答案将对以下方面产生重要影响 适应性变化的轨迹和ERS的来源。最后，它已经 有人提出，缓慢或延迟的运动可能会被编程为 不同的基础，因此反映了快速中未发现的错误 动静。 目标和方法 我们的目标是通过受试者内部的方式来解决这些问题， 析因研究。对于多个本地化措施和状态中的每一个 跳动增益自适应，我们将准确确定时间进程 暗淡和明亮的闪光在黑暗中出现的局部化，以前， 在水平扫视期间和之后。正常人类受试者会表现出 四种不同的本地化任务：立即或延迟指向 用眼睛或看不见的手。扫视将是：正常的，增益适应的 早期训练，训练后期适应收获。扫视将会是 适应操纵的视觉反馈，并由监控眼睛位置 漫反射缘-反射。 拟议的研究应有助于澄清 知觉-运动系统，特别是当它决定基于视觉的 马达性能。

Significance Experiments with rapid hand pointing demonstrate an extraretinal eye position signal (ERS) that is more accurate than intravisual comparison experiments and studies of visual stability once seemed to allow. Gaze pointing studies have drawn similar conclusions, but these experiments are seriously flawed and replication is long overdue. The motor system dependence and detailed time course of the ERS have not been studied in a well-controlled egocentric localization paradigm. The adaptability of saccadic eye movements raises the question of whether eye position can be decoupled from the ERS; the answer would have important implications for the locus of adaptive change and the source of the ERS. Finally, it has been suggested that slow or delayed motor movements might be programmed on a different basis, and therefore reflect errors not seen with rapid movements. Objectives and Methods Our objective is to address these questions with a within-subjects, factorial study. For each of several localization measures and states of saccadic gain adaptation, we will accurately determine the time course of localizations of dim and bright flashes presented in the dark, before, during, and after horizontal saccades. Normal human subjects will perform four different localization tasks: immediate or delayed pointing either with the eye or with unseen hand. Saccades will be: normal, gain-adapted early in training, and gain-adapted late in training. Saccades will be adapted with manipulated visual feedback, and eye position monitored by diffuse limbus-reflection. The proposed studies should help clarify the functional connectivity of the perceptual-motor system, particularly as it determines visually-based motor performance.